HOW TO CORRECTLY WATERPROOF TILED SHOWERS …

or 6 mm thick fibre-cement sheet tile underlay laid over flooring (minimum H1.2 flooring or H3 plywood) and fixed according to the manufacturer’s instructions. The substrate must not deflect more than 1/360th of the span under dead and live loads. For example, where L = the span between joists: if L = 400 mm L/360 = 400/360 = 1.1 mm is maximum

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